/**
 * Copyright (C) 2007 The AsyncMail Group <asyncmail@googlegroups.com>
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *         http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.googlecode.asyncmail.smtpserver.handler;

import com.googlecode.asyncmail.common.DSNStatus;
import com.googlecode.asyncmail.smtp.SMTPRequest;
import com.googlecode.asyncmail.smtp.SMTPRequestImpl;
import com.googlecode.asyncmail.smtp.SMTPResponse;
import com.googlecode.asyncmail.smtp.SMTPResponseImpl;
import com.googlecode.asyncmail.smtp.SMTPRetCode;
import com.googlecode.asyncmail.smtpserver.SMTPSession;
import com.googlecode.asyncmail.smtpserver.core.CommandHandler;

import java.util.ArrayList;
import java.util.Collection;

/**
 * Handles NOOP command
 */
public class NoopCmdHandler implements CommandHandler {

    /**
     * The name of the command handled by the command handler
     */
    private final static String COMMAND_NAME = "NOOP";

    /**
     * Handler method called upon receipt of a NOOP command. Just sends back an
     * OK and logs the command.
     * 
     * @see com.googlecode.asyncmail.smtpserver.core.CommandHandler#onCommand(com.googlecode.asyncmail.smtpserver.SMTPSession,
     *      SMTPRequestImpl)
     */
    public SMTPResponse onCommand(SMTPSession session, SMTPRequest command) {
        return new SMTPResponseImpl(SMTPRetCode.MAIL_OK, DSNStatus.getStatus(
                DSNStatus.SUCCESS, DSNStatus.UNDEFINED_STATUS)
                + " OK");
    }

    /**
     * @see com.googlecode.asyncmail.smtpserver.core.CommandHandler#getImplCommands()
     */
    public Collection<String> getImplCommands() {
        Collection<String> implCommands = new ArrayList<String>();
        implCommands.add(COMMAND_NAME);

        return implCommands;
    }
}
